Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

A reconciliation of the asset retirement obligations for 2012 follows:

	(In millions)
Asset retirement obligations at December 31, 2011	$	1,593
Accretion	100
Liabilities incurred	27
Liabilities settled	(11		)
Revision in estimated cash flows	10
Asset retirement obligations at December 31, 2012	1,719